Carriage shift control mechanism



Dec. 30, 1941. A F 011- 2,268,166 CARRIAGE SHIFT CONTROL MECHANISM Original Filed Sept. 23, 1931 6 Sheets-Sheet l Dec. 30, 1941. A. F. PCTT Dec. 30, 1941. A. F. POTT CARRIAGE SHIFT CONTROL MECHANISM" Original Filed Sept. 23, 1931 6 Sheets-Sheet 3 Dec. 30, 1941.

A. F. POTT CARRIAGE SHIFT CONTROL MECHANISM Dec. 30, 1941. A. F. POTT CARRIAGE SHIFT CONTROL MECHANISM 6 Sheets-Sheet 5 Original Filed Sept. 25, 1931 Dec. 30, 1941. A. F; p -r CARRIAGE SHIFT CONTROL MECHANISM 6 Sheets- Sheet 6 Original Filed Sept. 23, 1931 Patented Dec. 30, 1941 CARRIAGE SHIFT CONTROL MECHANISM August Friedrich Pott, Zella-Mehlis, Germany, assignor to Mercedes Buromaschinen-Werke Zella-Mehlis, Thuringia,

Aktiengesellschaft, Germany Original application September 23, 1931, Serial .No. 564,643. Divided and this application June 10, 1937,, Serial No. 147,587.

beer 2, 1930 In Germany Octo- Claims. (01. 235--63) My invention relates to improvements in carriage shift control mechanism of the type exemplified in my co-pending application for U. S.

Letters Patent Serial No. 564,643 died September 23, 1931, and of which the present application is a division.

The primary object of my invention is the provision of an efficient motor drive for the carriages of such machines embodying simplified drive controlling means rendered effective by carriage advancing and retracting keys,'to drive the carriage in opposite directions respectively and automatically conditioned under control of the carriage to reverse the direction of the drive at the end of the carriage movement in either direction, together with means automatically operative in the limit of movement of the carriage in either direction to positively return whichever key is held depressed and with a repulsor effect exerted 'in opposition to pressure exerted on the key by the operator.

Other and subordinate objects will presently appear when the following description and claims are read with reference to the drawings accompanying and forming part of this specification.

In said drawings: I

Figure 1 is a vlewin perspective of a machine equipped according to my invention, the cover plate being partly removed to show the interior mechanism,

shaft, a carriage clutch thereon and reverse gearing between said clutch and the carriage,

Fig. 4 is a similar view looking in'the reverse direction,

Fig. 5 is a view in perspective of the main drive shaft and the before mentioned clutch the parts being shown disassembled for cleamess of illustration,

Fig. 6 is a-view in perspective of parts of the reverse gearing for the carriage drive the parts being shown disassembled,

Fig. 7 is a view in side elevation of a. rack and pin gear forming part of the carriage driving mechanism,

' Fig. 8 is a similar view illustrating the operation of said rack and gear,

Fig. 9 is a view in perspective of parts of means for controlling the carriage under depression of the carriage advancing and retracting keys respectively,

Fig. 10 is a similar view of details of said means,

Fig. 11 is a view in perspective of a clutch control shaft, operating connections between the carriage advancing and retracting keys and said shaft and the reverse gearing and also operating connections between the multiplication controlling lever and said gearing,

Fig. 12 is a similar view of said shaft and parts directly associated therewith,

Fig. 13 is a view in'perspective showing the arrangement of the .multiplication controlling lever of the machine, connections between the same and the reverse gearing and also illustrating the carriage advancing and retracting keys in detail, a

Fig. 14 is a view in longitudinal section of the carriage taken in different planes indicated by the lines "-44, Ii -l4, li -Il of Fig. 15 and looking in the direction of the arrows,

Fig. 15 is a view in transverse section taken through the carriage along the line i5-l5 of Fig. 14 looking in the direction indicated by the arrows, and

Fig. 16 is a view in perspectiveillustrating the motor controlling mechanism.

The carriage In the type of machine with'which my invention is more particularly concerned to wit, the Mercedes Euclid, the usual carriage C supporting the result register or accumulator A, and the revolutions counter R. C., is mounted, in a manner well understood, for step by step advance The carriage drive A motor I, suitably mounted on the rear frame 2 of the machine, is operatively .connected by a worm 3 and worm gear 4 to a main drive shaft 5 journaled in any suitable manner in said frame and rotating in the direction of the arrow (Figs. 3 to 5 and 16).

0n the drive shaft 5 is a carriage shift clutch 86 (Figs. 3, 4, 5) of the single revolution type comprising a pair of circular housing members 86, 86 a-trip pawl 88 pivoted therebetween for engagement with a' ratchet tooth member ll fast on said shaft, a spring 01 tensioning said pawl for such engagement, and a clutch tripping dog 04 fast on a clutchcontrol rock shaft 25 suitably Journalledin the machine frame 2 for movement to swing said dog in opposite directions into and out of tripping relation to said pawl respectively. In its tripping relation dog ll cooperates with a tooth l 'onsaid' pawl 80 as will be understood.

The carriage clutch 85 is designed to beoperativelyconnected to the usual carriage shift protripping dog time non-tripping position rela- 1 tive to the carriage clutch trip pawl lland-permit engagement of the carriage shift clutch llto follow in a manner which will be understood.

7 On the main drive shaft5 a. cam Il'la (Eig.

, 16) formed with conicallyextending circumferpelllng rack I through the medium of-reverse gearing (Fig. 7lcomprising a pin gear Ill meshing with said rack I28 and fast on a suitably journalled sleeve I22, a pair of opposed gears ll, 7

B2 loose on said sleeve the former meshing with a gear Ill fast on clutch member 85" and the latter meshing with an idler gear 52'- driven by the gear I09, a draw key 60 settable in said sleeve and having a key lug 59, and key ways. I22, I03 and 5| in said sleeveand gears 62, 8I, respec-= tively, whereby in different set positions. of said draw key one or, the other of said gears ll, 52 may be coupled to said sleeve and said gearing vconditioned for advance or retraction of the carriage C. As'will be understood, when the gear 6i is coupled with the gear I09, and when the gear 52 is coupled with the gear 62" they are rotated in opposite-directions relative to each other. Thegears 62. and 8! are left and right hand driving gears, respectively, or in other direction round the: shaft '25. Through contact mice, is non-rotatablymounted, which cam acts on arm Il5a of a two-armedcontact lever I05. The arm Il5a in its rest position lies on the conical circumference Ill. of the cam "la and is held in this position by means of a spring Illb attached at one end to a lug "Sc-of the arm "511- of the lever I05, and at its other end to a nose; Illa of a lever ML, The lever Ill which is swingably mounted on theshaft- Illb has a forwardLv and an upwardly projecting arm 09 and 99a, respectively. A spring I65 attached at one end to a pin of the lever arm 95 and at its other end to the machine frame in any suitable manner, acts on the lever Ill in the clockwise of the roller 99b of the arm-99, of the lever Ill with the face I55a of the lever I55 the normal position is determined. 0n the upwardly pro-.

jecting arm ll'aeof the lever ill the two-armed lever --Il5, previously mentioned isswingably I mounted. This acts with the downwardly prosaid rocking movement of the shaft 25 thelever words carriage advancing andretracting ears 1 respectively. The ratio of the drive between the gears Ill and GI, 52 is two to one fora purpose presently seen. ,7

Drive controlling means In conjunction with the'foregoing key operated drive controlling means are provided for setting the draw key 50 and conditioning the reverse gearing as follows:

At one side of the key board if (Figs. 1, 1s)- Jecting limb ill on a contact carrier Ill. 0n the free end of this carrier a contact pin Illa is fixed, which coacts with a contact pin 82" fastened to an angle piece' 9?. On the previously I56 participates, whereby the face I556 of the lever I55 acts on" the roller 58?) of the lever I M and this swings against the action of the spring I round the shaft Ill-lb.- Bereby the contact lever "5 is displaced in the anti-clockwise direction. andthe arm Ilia of the lever 05 which normally throughthe action or the spring I05b is brought into contact with the conical periphery Ill of the-cam Illa, slips oil. from the same.

7 The contact lever I05 with its end I55 can now are carriage advancingand retracting, or left and right hand carriage shifting keys 7 and 0, respectively. Surmounting a pair of key levers l3 and II, respectively, pivoted, as at l3, sideby side on a fixed shaft I0 for'depression through a guide plate Il ment. 7 r V The pair of key levers I3 and l 2 are operatively connected to a pair of hell cranks I5 and Il, re-

spectively; (Figs. 9 and 11,) pivotally mountedside by1-side, on a suitably fixed transverse shaft 2l to each provide a horizontally extending arm I1, in the case of hell crank I5,- and 22 in the case of 1 bell crank I9. A pair of links I0 and Il operatively connect saidkey levers Iland I 2 to the bell cranks l5 and Il, respectively, so that depression of said levers correspondin moves the arm (I and .22 for a purpose presently clear. A

pair of coil springs Band 32 secured to said.

arms and -22,"as at 00 and ll, respectively, tension said arms and the key levers I3 and I2 against depression from normal position as established by contact of the levers 1: and I2 with guide plate Il (Fig. I)

. The bell crank arm 11, 22am each provided with a depending -lug Iland '2I normally bearing against opposed arms I0 and 20' of a rectangular crank-- member 23 fast upon' the" before mentioned clutchcontrol shaft 25 so that .upon depression of either keyI or! said shaft will be rocked by the related bell crank 15 or ll, as the may e, iiiadirection to-swing the clutch?" under the action of thespring I 855, swing in the anti-clockwisedirectiomwhereby under the ac-i tion of the contact springllljthe motor contact 92 and Illa is closed. :The motorI now oomwhich limitstheir upward move- 'mences to run in the clockwise direction and rotates the drive shaft 5 by the worm 3 disposed on. the motor shaft through the worm wheeld in the anti-clockwise direction. If the face Ia of thelever I55 has released the roller 9017, also the parts 99, Ill, I05 return into their rest position under the action of the spring I05, as

soon as the lever I05 at a suitable moment slides on the cam Illa at Illa. When this is eifected the cam "10 swin s the lever I05 in the clockwise directiom-whereby thecontact spring Ill is pressed together and the contact l2-l0la is opened, so that the motor I againcomes to rest.

-If the curve Ill has swung out the lever; I05- completely, it slides under the action of the spring Il5b again on to the conical periphery I ll of the cam IlIa.

Intermediate the bell cranks I5 and I9 is 'a rocking unitfor setting the draw key and returning the keys I and 5 to normal position said unit comprising a draw key setting lever ll by side in pendent position upon a common horizontal pivot-ll (Fig.2) fixed on the rear of the (Figs. 9, '11), a key controlled lever 35 for operating said lever II and a carriage controlled lever nmr operating both levers GI and 55.. The levers. 35 and I? are swingably mounted side machine.

The key lever comprises a pair of 4 erated bell crank, as at 1|, and to a fixed part upper laterally extending arms III, III adapted to underlie the bell crank arms 11 and 22, respectively, a pendent intermediate yoke part 33, and a pair of lower laterally extending lugs." and 4|! embracing the lower end of the settin 5 lever 4| whereby it is operatively connected to the last named lever 4|.

The carriage controlled lever 41 comprises laterally extending arms I20, II4, an upstanding arm 285, and a yoke part 48 at one end of the arm II4 all for a purpose presently explained.

The setting lever 4| is slotted, as as 42, to permit relative compensating movement of the lever 4| relative to the other levers 35 and 41 for a purpose presently seen and comprises a pair of opposed laterally extending arms 44, 43 terminating in a pair of opposed lugs 46 and 45 underlying the arms I20, H4 0! the lever 41, respectively. A tension spring 53 connected to the arm 265 of the carriage controlled lever 41 and to a pin 54 on the setting lever 4| urges the latter upwardly so that the lugs 46 and 45 normally bear against the arms I20, I I4 of said lever 41 whereby the latter is operatively connected to the setting lever 4| for compensating yielding movement. relative thereto tor a purpose presently explained.

The draw key setting lever 4| is operatively connected to said key by means of a link 55 and a right angled yoke 58 including a horizontal biiurcated setting arm I2I engaging a groove 255 in said key, said yoke being pivoted, as-at points 51, 58, and the link being suitably connected thereto, the arrangement being such that swinging movement of said setting lever 4| in opposite directions couples the gears 6! and .62, respectively, to the sleeve I22 thereby conditioning the described reverse gearing for advance or retraction of the carriage C.

The carriage controlled lever 41 has operatively connected thereto, as by the slot and pin Hi and 63, one arm 64 of a suitably pivoted carriage operated bell crank 66 the other arm I42 of which extends into the path of travel of a pair of right and left hand tappets 61 and 65, respectively, last on the carriage C.

Normally the carriage controlled lever 41, and hence the entire described unit is swung in a direction to couple the left drive gear 62 to the sleeve I22 and thereby condition the described 4 reverse gearing for left hand drive of the carriage C. This is accomplished by means of a tension spring 10' connected to the carriage opof the machine. In this normal position, the described parts including the unit are in an opposite position to that shown in Figs. 2 and 9, in which position the lever and the unit are operated to couple the right drive gear 6| to the sleeve in for operating the described reverse gearing for right hand drive of the carriage C.

On the lever 35 and before mentioned crank member 23 of clutch control shaft 25 are coacting locking elements comprising a lug I" de pending from the upper edge of the yoke part 38 of said lever and a right angled locking dog 26 pivoted on said shaft in a slot 36 in said member 23 to project into said yoke part 88. below said lug. A stop arm 300 on the dog 24 coacting with the bottom of the slot 36 limits pivotal movement of said dog in one direction. A

. suitably connected spring 28 tensions the dog 23 against movement in the opposite direction.- In the normal position of the clutch control shaft 25 and clutch tripping dog 36, said tripping dog m and renders the motor eilective has previously 33, said member 23 and the described unit are in such positions that the locking dog 26 of the member 23 is located on the left hand side of the lug III and on the level of the under edge of the-lug II1.

vriage advancing and retracting keys 1 and 8 effects engagement of the carriage shift clutch 86 been described. The operation of the remaining parts of the drive controlling means will now be' described and first with reference to operations following upon depression of the right hand drive or carriage retracting key 8.

Upon depression of said key 8 the arm 22 of the related bell crank I6, engages the arm III of lever 35 and swings the latter from normal position together with the levers 4| and 41 into the position shown in Figs. 2 and 9 whereby as will be understood the draw key couples the gear 6| to sleeve I22 and thereby conditions the reverse gearing for right hand drive of the carriage. It will of course be understood that the key way 6| oi! the gear 6| is aligned with key way I22 of sleeve |22 in the normal position of the parts so that such coupling is possible. Simult'aneously with movement of the lever 35 into the proper position the arm |6| thereof engages under the arm 11 of bell crank 15 and locks the key 1 against depression. During initial movement of the lever 35, and levers 4|, 41, the lockthe shaft 25 in the clockwise direction (Fig. 12)

The locking dog 26, which is yieldlngly connected with said member 23 cannot participate in this rocking movement of the member 23, since it isin working-position to the under edge of the lug 1. Consequently the spring 28 is hereby tensioned against said rocking movement of the parts 23 and 25. At the end of said rocking movement of the levers 35, 4| and 41 to condition the reverse gearing for right hand drive of the carriage the locking dog 26 snaps upwardly upon the right hand side of the lug I I1 under the action of the tensioned spring 28 to lock said lever 35 and consequently the levers 4|. 41 link 55. yoke 56 and draw key 60 against return during depression of said key 8.

The carriage C now moves to the right as long as said key 8 is held depressed. Considering the desired ease of manipulation of the machine, the pressure exerted upon the key by the operator for holding said key in depressed position is comparatively slight. Near the end of carriage run in said direction the tappet 69 engages the arm 142 of the bell crank 66 and returns the carriage controlled lever 41 to normal position. However at this point in the operation of the machine the sleeve I22 and draw key 60 have not yet rotated into a position in which the lug 59 on said draw key registers withthe key way I43 in the left drive gear 62 so that setting of said draw key into a position to couple said gear to said sleeve and thereby condition the reverse gearing for left hand driving operation is blocked by said gear 62. To obviate jamming of the parts under this condition the before mentioned compensating movement is provided for between the lever 4| and levers 35 and 41. The lever 4| on swing 4-" sesame ing movement of lever 41 to normal position tappettl thereon engages the bell crank 66 and moves downwardly under pressure exerted against swings the sametogether with the lever 41 into the lug 46 thereof by arm I of lever 41. The the position illustrated in Figs. 2 and 9. Up to lever ll is thus tensioned by the spring 53 so this point the left drive gear 62, sleeve I22 and that as soon as. the lug 59 of draw key 60 regis- .5 draw key 60 have not yet completed a full revoters with the key way I43 of gear 62 the lever lution and consequently the draw key lug 59 is II underthe tension of spring 53 is roeked'on blocked by the face of the right drive gear H the fulcrum afforded by engagement with said from entering the keyway 6| thereof and therearm I20 toconditl'on the reverse gearing for left by coupling said gear 6i to sleeve I22. As soon hand drive of the carriage CL j 19 as this condition isobviated by complete rotation As an incident to return of the lever 41 to of the parts 62, I22, 69 the reverse gearing is normal position the arm I ll thereof forces the conditioned for right hand drive of the carriage bell crank I9 back into vnormal position -by upin a manner which will be clear without detailed ward pressure against the arm 22 of said crank. description thereof. As'an incident to swinging This upward pressure is transmitted by means .15 of the lever 47 the arm I20 thereof operates bell of the parts I8 and I2 to the depressed key 8 crank 11 to positively return key -1 and key 8 and is of such degree as. to overcome any presis unlocked as.will-be obvious. The clutch 86 is sure exerted on the key bythe operator. The now disengaged and the motor. contacts broken carriage retracting key 8 is thus positively rel sts-s previously d turned to normal position therebyhreaking the 20 Returning now to he p n I it W ll e locking relation of the lug II? of lever 35 and noted that said gear is of the type embodyin the locking dog 26 so that said lever 35 is re- P f m ric y pp s d Pins I25, I26 op rturned to normal position as an incident to such atine in the interden a spaces of the ac I28 return oflever II thereby unlocking the carriage and normally disposed in a horizontal plane. In advancing key I; thi form. of rack 'and'gear drive, the speed of Coincidently with .retum of the carriage re-V movement of the carriage C through each step or' tracting key 0 the clutch control shaft 25 is increment of movement thereof varies under released and rocked in a direction to swing the uniform driving speed of the motor, being slowclutch tripping dog 84 back into tripping position est during substantially the first and fourth by means of a spring 93 connected to said dog 30 phase of revolution of said gear or during the I and to a lever I56 (Fig. 16) which forms no arcs of movement of said pins represented in Fig. part per se of the present invention and need 8 at I36, I39 respectively. This together with merely be identified in Such rocking of other factors inherent in such rack gear drives, the clutch control shaft 25 dog 05 isoonand well understood in the art, results in a nontingent upon rotation ofthe clutch 66 through uniform load being imposed .on said gear and a complete revolution or in other words into full consequently on the can'iage shift clutch 86 tendcycle position. As long as said clutch is out of ing to cause a grabbing action between the clutch full circle position a comb I58 therein blocks pawl 86 and ratchet member 90 particularly in swinging movement of -said dog 0| back into tripthe last phase of operation of said clutch. The

ping position in a manner fully described in my 40 result ofthis situation is that resistance to recopending application previously noted. a lease of thepawl 88 or to tripping thereof in- As will be understood coincidentally with re-' creases in the final phase of rotation of the turn vof the clutch tripping dog II to clutch. 'I'o obviate-this difliculty spring 0* of position the contacts M, 92 are opened through the detent lever I40 sufliciently reactive against returnof the described contact controlling parts the pins I25 and I26 to boost the speed the to normal position by the conjoint action of carriage in the final phase of each step of move- Spring 63 and cam I06. l 'ment thereof slightly ahead of that of the drive It should lie-mentioned at this point that in a shaft 5 thereby facilitating release or trippingthe' event of single stroke operations of the key of the pawl 08. As will be clear the detent lever l the coacting locking lug I" and'dog-Zi pro- I40 also prevents overthrow movement of said .vide for locking the key down and the. draw key carriage 0..

60 in properly set positionto insure a complete cycle of operation of the drive and therefor a control m multiplication complete step of movement of the carriage c. The machine of my previously noted applicae d g peration under control of'the cari is quipp d wi h m ans for performing m lriage advancing or left spacing key I. the lug tlplicatlon in either direction of travel of the "of the related bell crank I5 bearsagainst the carriage C and-including a multiplication control arm II of crank member 23 and operates the lever 232 settable in opposite directions respecclutch control shaft to swing the clutch shifting flvelydog in the same manner as described with refer- The arriage drive of the presen p ion ence to key 6. Since the levers II, II, 35, link 5!, s3 is controlled by said lever also. Only these parts yoke 66 and draw key are normally set, by of the said multiplication mechanism entering v the spring 'llto condition the reverse gearing into such control will be described herein. For for left hand drive of the carriage no operation a detailed understanding of the complete mechof these parts is required under deprasion of 335 anism reference may. be had to said copending said key I. Upon complete depression of the application.

' key I the arm I? of the related bell crank I5 The multiplication lever 232 (Fig. 13), in one engages -the arm I" of the lever 35.; The arm setting thereof attained by swinging the same III of said lever in the'normal position of the clockwise to the position as viewed in said figure, latter eng ges the under edge of the arm 22 of 7 is retained in said set position by means of tenbell crank-I0. Consequently the. key I islocked 'sioned detent slide 232'. Such setting of lever against depression under depression of the key f 23! moves a connecting rod 52 and swings a bell, 1. The masec now steps to the leftas long crank'il (Fig. 11) pivotally mounted on the shaft asthe key I is held depressed. .Asthe caniage '20 clockwise as viewed in said fi ure. The bell approaches the end .of it's left hand crank il comprises a horizontally extending arm 

